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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/25490
Title: The pfmdr1 gene is associated with a multidrug-resistant phenotype in Plasmodium falciparum from the western border of Thailand
Authors: R. N. Price
C. Cassar
A. Brockman
M. Duraisingh
M. Van Vugt
N. J. White
F. Nosten
S. Krishna
St George's University of London
London School of Hygiene & Tropical Medicine
John Radcliffe Hospital
Mahidol University
Academic Medical Centre, University of Amsterdam
Keywords: Medicine
Issue Date: 22-Dec-1999
Citation: Antimicrobial Agents and Chemotherapy. Vol.43, No.12 (1999), 2943-2949
Abstract: On the western border of Thailand, Plasmodium falciparum has become resistant to almost all antimalarial agents. The molecular basis of resistance in these parasite populations has not been well characterized. This study assessed genetic polymorphisms in the pfmdr1 gene in 54 parasites collected from the western border of Thailand to determine the relationship of pfmdr1 copy number and codon mutations with parasite sensitivities to mefloquine, chloroquine, halofantrine, quinine, and artesunate assessed in vitro. A point mutation at codon 86 (resulting in a change of Asn to Tyr) was associated with a significantly lower 50% inhibitory concentration (IC50) of mefloquine (median, 9 ng/ml versus 52.4 ng/ml; P = 0.003). Overall 35% of the isolates (19 of 54) had an increase in pfmdr1 copy number, and all 19 carried the wild-type allele at codon 86. Increased pfmdr1 copy number was associated with higher IC50s of mefloquine (P = 0.04) and artesunate (P = 0.005), independent of polymorphism at codon 86. The relationship between pfmdr1 and resistance to structurally distinct antimalarial agents confirms the presence of a true multidrug-resistant phenotype.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0032804039&origin=inward
http://repository.li.mahidol.ac.th/dspace/handle/123456789/25490
ISSN: 00664804
Appears in Collections:Scopus 1991-2000

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